Split type carbon brush bracket and manufacturing method thereof

Abstract

The invention discloses a split type carbon brush bracket and a manufacturing method of the split type carbon brush bracket. The split type carbon brush bracket comprises a plurality of metal terminals and a positioning framework, wherein the framework comprises a main body part and a support part which is vertically connected at one side of the main body part; a groove is formed at the other side of the main body part; the support part is a cavity of which one end is opened; the cavity is communicated with the groove; a positioning hole is formed at the other end of the support part; each metal terminal comprises a carbon brush connection part inside the groove and a lead connecting part which is arranged in the cavity and stretches from the positioning hole; the split type carbon brush bracket further comprises a filler inside the cavity and a shell which is wrapped on the main body part in an injection molding mode. According to the split type carbon brush bracket and the manufacturing method of the split type carbon brush bracket, by fixing the metal terminal through a premolded positioning framework, the positioning precision of the metal terminal is increased; by filling the cavity, the air tightness between the metal terminal and the resin is increased; as the metal terminal is arranged inside the groove and is fixed, the flowing of the resin is not affected when the shell is subject to injection molding, so that the size precision of the carbon brush bracket is increased.

Description

technical field [0001] The invention relates to the technical field of motor manufacturing, in particular to a split carbon brush holder applied to an automobile ABS system and a manufacturing method thereof. Background technique [0002] At present, the automotive ABS (Anti-lock braking system) system is developing in the direction of miniaturization, modularization and standardization. The ABS motor used to drive the pump body requires its small size, high dimensional accuracy, and good sealing of metal terminals. Such as figure 1 , figure 2 As shown, the integrated carbon brush holder 100 of the prior art includes a disc-shaped carbon brush holder main body 110 and a cylindrical support 120 vertically connected to one side of the carbon brush holder main body 110, a negative metal terminal 101 and A part of the positive metal terminal 102 is located in the support body 120 and protrudes from the support body 120 for connecting with wires. The other part of the negativ...

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Problems solved by technology

[0003] The manufacturing process of the carbon brush holder 100 in the prior art is to directly put the negative electrode metal terminal 101 and the positive electrode metal terminal 102 into the mold, and inject resin into the carbon brush holder 100 as a whole, but due to the negative and positive metal terminals 101 and 102 and the The thermal expansion coefficients of the resins forming the carbon brush holder 100 are very different, and the bonding force between ordinary insulating resins and metal terminals is poor, so there is a gap between the negative metal terminal 101 or the positive metal terminal 102 and the carbon brush holder 100, Unable to meet the strict requirements of the ABS system for the airtightness of the motor

In addition, in the integrated injection molding method of the prior art, the negative metal terminal 101 or the positive metal terminal 102 is directly placed in the injection mold. During injection molding, the strong flow pressure and temperature of the resin will affect the negative metal terminal 101 or positive metal terminal. 102 causes impact, which directly affects the shape and dimensional accuracy of metal terminals

Furthermore, due to the complex structure of the carbon brush holder, the resin is hindered by the shape of the terminal during injection molding, and the flow direction is uncertain, resulting in unstable resin density inside the injection molded body of the carbon brush holder. The shrinkage and deformation are inconsistent, which affects the shape and dimensional accuracy of the carbon brush holder

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